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xdgmime: Handle buggy type definitions with circular inheritance

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This fixes a stack overflow reported by a user who had both the
definition of text/javascript from shared-mime-info 2.3 and the
definition of text/javascript from shared-mime-info 2.4 installed at the
same time. In 2.3, text/javascript is a subtype of
application/ecmascript, but in 2.4 application/ecmascript is a subtype
of text/javascript. Having both at the same time resulted in circular
inheritance.

The new logic keeps a list of all parents that have already been
checked, which is more comprehensive than the old workaround that was
implemented in commit 38869ece2 ("xdgmime: Prevent infinite loops from
badly-formed MIME registrations").

https://bugs.archlinux.org/task/80279
This commit is contained in:
Alex Henrie
2023-11-19 15:54:27 -07:00
parent 09b728b2da
commit d9c50cac5d
4 changed files with 74 additions and 22 deletions
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3
gio/xdgmime/xdgmimecache.h
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@@ -70,7 +70,8 @@ int _xdg_mime_cache_mime_type_equal (const char *mime_a,
int _xdg_mime_cache_media_type_equal (const char *mime_a,
const char *mime_b);
int _xdg_mime_cache_mime_type_subclass (const char *mime_a,
const char *mime_b);
const char *mime_b,
const char **seen);
char **_xdg_mime_cache_list_mime_parents (const char *mime);
const char *_xdg_mime_cache_unalias_mime_type (const char *mime);
int _xdg_mime_cache_get_max_buffer_extents (void);